http://www.scoop.co.nz/stories/AK0808/S00090.htm
Isohyets are lines in which connect areas of equal rainfall over a certain amount of time. These maps are similiar to topographic maps in that the closer the lines are to one another the higher the value they represent is. The map above shows the amount of rainfall in a certain area during the month of July. The blue lines are the isohyets and resemble equal areas of rainfall.
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